About J0622+3749
J0622+3749 is an uncommon pulsar. It spins once every 333.208 ms and carries a surface magnetic field around 2.95×10^12 G.
The collapsed core of a star that exploded: about one and a half Suns of matter crushed into a ball the size of a city, held up only by the refusal of neutrons to be squeezed further.